Salon space rent or split commission?

I emailed a salon recently about allowing me to rent a space to do makeup for clients. It's an all hair salon but I told them that it's a good idea to have someone who can makeup there to bring in more clients. They called and the receptionist asked me a few questions like what days I want to work and if I'm looking for full time and part time. And a few other questions. I asked her if I had a choice between leasing a space or splitting commission and she said she didn't know that I would have to talk to the manager about it and she would call me later. She called me today and asked for me to come for an interview later on today.

So my question is, if they offer me to rent the space or split commission, which is the better choice? Keeping in mind that I'm a makeup artist and they generally make less than a hairstylist per week.

I've heard that if you split commission, you get payed hourly which I didn't know. If I rent the space I get to keep all my money and I obviously wouldn't get payed by them hourly. If you've worked in a salon or know anyone who has, do you get payed hourly if you split commission? Or it depends on the salon? I appreciate any answers I can get. =]